This is GM’s incredible secret stash of cars

Take an undercover trip round the General’s jaw-dropping collection of Cadillacs, Corvettes and crackpot concepts

1959 Cadillac Eldorado Biarritz ConvertibleThe height of American ostentation. Standard kit included air suspension, power windows, a 345bhp V8 and, of course, two of the grandest tailfins ever seen on a production car.